[X86] Fix handling of i128<->fp on Windows

On Windows, i128 arguments are passed as indirect arguments, and
they are returned in xmm0.

This is mostly fixed up by `WinX86_64ABIInfo::classify` in Clang, making
the IR functions return v2i64 instead of i128, and making the arguments
indirect. However for cases where libcalls are generated in the target
lowering, the lowering uses the default x86_64 calling convention for
i128, where they are passed/returned as a register pair.

Add custom lowering logic, similar to the existing logic for i128
div/mod (added in 4a406d32),
manually making the libcall (while overriding the return type to
v2i64 or passing the arguments as pointers to arguments on the stack).

X86CallingConv.td doesn't seem to handle i128 at all, otherwise
the windows specific behaviours would ideally be implemented as
overrides there, in generic code, handling these cases automatically.

This fixes https://bugs.llvm.org/show_bug.cgi?id=48940.

Differential Revision: https://reviews.llvm.org/D110413